only need an answer of branch 4 only

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  Swapna answered this

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  // Client side implementation of UDP client-server model
  #include <stdio.h>
  #include <stdlib.h>
  #include <unistd.h>
  #include <string.h>
  #include <sys/types.h>
  #include <sys/socket.h>
  #include <arpa/inet.h>
  #include <netinet/in.h>
    
  #define PORT 8080
  #define MAXLINE 1024
    
  // Driver code
  int main() {
  int sockfd;
  char buffer[MAXLINE];
  char *hello = "Hello from client";
  struct sockaddr_in servaddr;
    
  // Creating socket file descriptor
  if ( (sockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0 ) {
  perror("socket creation failed");
  exit(EXIT_FAILURE);
  }
    
  memset(&servaddr, 0, sizeof(servaddr));
    
  // Filling server information
  servaddr.sin_family = AF_INET;
  servaddr.sin_port = htons(PORT);
  servaddr.sin_addr.s_addr = INADDR_ANY;
    
  int n, len;
    
  sendto(sockfd, (const char *)hello, strlen(hello),
  MSG_CONFIRM, (const struct sockaddr *) &servaddr,
  sizeof(servaddr));
  printf("Hello message sent.\n");
    
  n = recvfrom(sockfd, (char *)buffer, MAXLINE,
  MSG_WAITALL, (struct sockaddr *) &servaddr,
  &len);
  buffer[n] = '\0';
  printf("Server : %s\n", buffer);
    
  close(sockfd);
  return 0;
  }
  Output :
  $ ./server
  Client : Hello from client
  Hello message sent.
  $ ./client
  Hello message sent.
  Server : Hello from server

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